CVE-2026-101179 in HarmonyOS
Summary
by MITRE • 11/02/2026
Buffer overflow vulnerability in the file preview module. Impact: Successful exploitation of this vulnerability may affect availability.
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Analysis
by VulDB Data Team • 11/02/2026
The identified security issue resides within the file preview functionality of the application, specifically manifesting as a buffer overflow condition. This type of vulnerability typically arises when software writes more data to a fixed-length block of memory than it is designed to hold, often due to insufficient boundary checks on input parameters or improper handling of variable-length strings and binary payloads. In the context of file previews, this flaw likely occurs during the parsing or rendering process where user-supplied content from uploaded files is processed without adequate validation against expected size limits or structural integrity constraints. The root cause generally involves legacy coding practices or a lack of modern memory-safe programming constructs that would automatically manage buffer boundaries and prevent out-of-bounds writes.
From an operational perspective, while the immediate impact statement highlights availability as the primary concern, it is critical to recognize that buffer overflows are inherently multi-faceted threats. Although exploitation may currently be limited to causing a crash or service interruption by corrupting memory structures such as stack frames or heap metadata, this corruption can potentially lead to arbitrary code execution if an attacker carefully crafts malicious input to overwrite return addresses or function pointers. The availability impact stems from the application's inability to recover gracefully from these memory violations, resulting in process termination, system instability, or denial of service for legitimate users attempting to access file preview features. This disruption affects business continuity and can be leveraged by adversaries to degrade trust in the platform's reliability during critical operations.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-120 Buffer Copy without Checking Size of Input Classic, which describes situations where a program copies data into a buffer without verifying that the size fits within the allocated memory space. Additionally, depending on the specific mechanism of exploitation and its placement in the attack chain, it may relate to CWE-787 Out-of-bounds Write or CWE-121 Stack-based Buffer Overflow if the overflow occurs on the stack. In terms of adversary tactics, this flaw could facilitate initial access or privilege escalation within the ATT&CK framework, particularly under techniques involving exploitation for defense evasion or execution, although its current observed impact is primarily disruptive rather than covertly exploitable for persistence.
To mitigate this vulnerability and enhance the overall security posture, developers must implement rigorous input validation mechanisms that strictly enforce length constraints on all file metadata and content passed to the preview module. Utilizing memory-safe programming languages where feasible can significantly reduce the risk of such low-level memory corruption errors. Furthermore, deploying compiler-based protections like Stack Canaries, Address Space Layout Randomization (ASLR), and Data Execution Prevention (DEP) provides essential layers of defense that make exploitation more difficult even if a flaw exists. Regular static and dynamic code analysis tools should be integrated into the development lifecycle to detect buffer handling issues early, ensuring that all external inputs are sanitized before processing by sensitive components like file previewers.